books.google.com - "Wald's book is clearly the first textbook on general relativity with a totally modern point of view; and it succeeds very well where others are only partially successful. The book includes full discussions of many problems of current interest which are not treated in any extant book, and all these matters...https://books.google.com/books/about/General_Relativity.html?id=9S-hzg6-moYC&utm_source=gb-gplus-shareGeneral Relativity